【正文】 。If引導(dǎo)的條件狀語(yǔ)從句遵循主將從現(xiàn)的原則，故選D。 have B．will cut down。34．________ I got back, I found my mother cooking for me.A．When B．Before C．Since D．Although【答案】A【解析】試題分析：When當(dāng)……時(shí)；Before在……之前；Since由于，自從……以來(lái)；Although雖然，盡管?？疾橘e語(yǔ)從句和結(jié)果狀語(yǔ)從句。 that B．that 。when 當(dāng)……時(shí)候；if如果；though盡管。； B. unless 除非，表讓步；C. but但是，表轉(zhuǎn)折；D. or或者，表選擇。所以選B。故選B。29．There are fewer and fewer tigers in India. The situation will continue _______ humans stop hunting them for their fur and bones.A．if B．unless C．because D．since【答案】B【解析】試題分析：句意：印度有越來(lái)越少的老虎。28．—Did you catch the early bus this morning? —Yes. The bus started to move _ I got on it.A．though B．before C．a(chǎn)s soon as D．a(chǎn)s if【答案】C【解析】句意：你今天早上趕上早班車(chē)了嗎？——是的。如果你有更多的問(wèn)題，隨時(shí)找我?？疾閯?dòng)詞時(shí)態(tài)?？芍懊鎻木鋺?yīng)表示讓步狀語(yǔ)?？键c(diǎn)：考查動(dòng)詞時(shí)態(tài)。一不要擔(dān)心。 rings B．won’t begin。t succeed _____ you work hardA．if B．because C．unless D．so that【答案】C【解析】【詳解】句意：你不會(huì)成功的，除非你努力工作。結(jié)合語(yǔ)境可知選A。當(dāng)他到達(dá)機(jī)場(chǎng)時(shí)我將與他會(huì)面。 arrives B．will get to。根據(jù)下文he has a bad cold可知這里是表示原因。引導(dǎo)條件狀語(yǔ)從句用as long as只要。because 因?yàn)?，引?dǎo)原因狀語(yǔ)從句；though雖然，盡管，引導(dǎo)讓步狀語(yǔ)從句，類(lèi)似的詞還有although, even though, even if；until常和not連用，not …..until…意思是直到….才…..,引導(dǎo)時(shí)間狀語(yǔ)從句； so that為了，表示目的，引導(dǎo)目的狀語(yǔ)從句。18．I hate traveling by air______you usually have to wait for hours before the plane takes off.A．because B．though C．until D．so that【答案】A【解析】【詳解】句意：我討厭坐飛機(jī)旅行，因?yàn)橥ǔＲ壬蠋讉€(gè)小時(shí)才能起飛。根據(jù)句意可知，表示“直到我們陷入麻煩才能理解他們”，not...until...直到……才……，故選D。until直到…時(shí)候；although盡管，雖然；so that以至于，為的是；as soon as一…就…。A. got 表示一般過(guò)去時(shí)；B. will get 是一般將來(lái)時(shí)；C. get 是一般現(xiàn)在時(shí)。A. unless除非；B. if如果；C. until直到；D. since 自從。s start our training for the basketball game.—OK. We39?？疾檫B詞?？梢?，如果你的作業(yè)完成。本題表示“當(dāng)……時(shí)”，knock是非延續(xù)性動(dòng)詞，故選C。昨晚演奏的音樂(lè)家從小就學(xué)會(huì)了演奏二胡。 was D．learned?？键c(diǎn)：考查連詞。故答案選D。7．___________ she couldn’t see his face, she could tell by his voice that he was young.A．Unless B．If C．Because D．Though【答案】D【解析】【詳解】句意：雖然她看不見(jiàn)他的臉，但是她能夠通過(guò)聲音分辨出他很年輕。才 B. before 在本題考查連詞詞義辨析。之前；because因?yàn)??？键c(diǎn)：考查動(dòng)詞時(shí)態(tài)。 ask D．won’t。故選B。3．There are fewer and fewer tigers in India. The situation will continue _______ humans stop hunting them for their fur and bones.A．if B．unless C．because D．since【答案】B【解析】試題分析：句意：印度有越來(lái)越少的老虎。句子Many college students go to West China to help local people和句子they may find a good job in big ，因此選擇although盡管；故選C。A. because因?yàn)椋籅. if如果；C. although盡管；D. after在……之后。since后跟時(shí)間狀語(yǔ)從句時(shí)，表示的是到目前為止的時(shí)間段，從句時(shí)態(tài)為一般過(guò)去時(shí)，而主句的時(shí)態(tài)為現(xiàn)在完成時(shí)，故正確答案為A?！叭绻弧蓖Ｖ梗闆r會(huì)繼續(xù)。 will askC．don’t。此題考查if引導(dǎo)的條件狀語(yǔ)從句，主句一般將來(lái)時(shí)，從句一般現(xiàn)在時(shí)；故選A。6．Our teachers have been with us for nearly three years we came to junior high school. We should thank them for what they have done for us.A．until B．before C．since D．while【答案】C【解析】句意：自從我們來(lái)到初中，我們的老師們已經(jīng)和我們?cè)谝黄饘⒔炅?，我們?yīng)該感謝他們?yōu)槲覀兯龅囊磺?。之? C. since自從 D. while當(dāng)這里是since引導(dǎo)的時(shí)間狀語(yǔ)從句，主句用現(xiàn)在完成時(shí)態(tài)，從句用一般過(guò)去時(shí)態(tài)，其他不符合題意，故選C。結(jié)合句意可知，在這里兩個(gè)句子之間存在一個(gè)相反的讓步關(guān)系，though/although/even though雖然；盡管，引導(dǎo)讓步狀語(yǔ)從句，符合句意。所以選B。 amC．has learned。的確是這樣。A．unless如果不，除非；引導(dǎo)條件狀語(yǔ)從句；B．once一旦……，引導(dǎo)條件狀語(yǔ)從句；C．when當(dāng)……時(shí)，表示兩個(gè)動(dòng)作同時(shí)發(fā)生，主句一般使用過(guò)去時(shí)，從句使用過(guò)去進(jìn)行時(shí)；D．while當(dāng)……時(shí)